In order to provide feedback when adding a room to a group, the group summarry store needs to be extended to store the list of rooms in a group. This commit is the first step required.
The next step is to get the GroupRoomList listening to updates from GroupStore and expose the list of rooms from GroupStore.
(We're running out of words to describe the hierachy of things that store things)
* Read the new flag in the summary API (the one we were reading
was actually whether the group server listed you as a member to
non-members).
* Remove call to now-dead _loadGroupFromServer andf use the store
instead
- Acts as a layer between GroupView and the group APIs that modify the summary individually. This allows for abstraction of getting the new summary once a successful API hit has been done.
- The plan is to also control the avatar, topic, body of the summary via the same class
